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Light World Earthquakes Magnitude 4-4.9

Light earthquake, 4.4 mag was detected near Haveluloto in Tonga


Earthquake location -20.8417S, -178.0258WA light earthquake magnitude 4.4 (ml/mb) strikes 294 km W of Haveluloto, Tonga (183 miles) on Monday. Date and time of earthquake in UTC/GMT: 21/12/20 / 2020-12-21 17:46:24 / December 21, 2020 @ 5:46 pm. A tsunami warning has not been issued (Does not indicate if a tsunami actually did or will exist). Event ids that are associated to the earthquake: us6000d5fg. Id of event: us6000d5fg. The temblor was picked up at 17:46:24 / 5:46 pm (local time epicenter). The earthquake occurred at a depth of 470.89 km (293 miles) below the earth’s surface. Exact location of event, longitude -178.0258 West, latitude -20.8417 South, depth = 470.89 km.

In the past 24 hours, there have been five, in the last 10 days thirteen, in the past 30 days twenty-one and in the last 365 days one hundred and seventy-three earthquakes of magnitude 3.0 or greater that was reported nearby. There are an estimated 13,000 light earthquakes in the world each year. Earthquakes 4.0 to 5.0 are often felt, but only causes minor damage.

Questions or comments?

How did you react? Was there any damage to buildings? Leave a comment or report about shaking, activity and damage at your home, city and country. This information comes from the USGS Earthquake Notification Service. Read more about the earthquake, Seismometer information, Date-Time, Location, Distances, Parameters and details about this quake, recorded: 294 km W of Haveluloto, Tonga.

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More information

Parameter Value Description
Magnitude 4.4 mb The magnitude for the event.
Longitude -178.0258° West Decimal degrees longitude. Negative values for western longitudes.
Latitude -20.8417° South Decimal degrees latitude. Negative values for southern latitudes.
Depth 470.89 km Depth of the event in kilometers.
Place 294 km W of Haveluloto, Tonga Textual description of named geographic region near to the event. This may be a city name, or a Flinn-Engdahl Region name.
Time 2020-12-21 17:46:24 Time when the event occurred. UTC/GMT
Updated 2021-01-05 15:07:47 Time when the event was most recently updated. UTC/GMT
Timezone offset Timezone offset from UTC in minutes at the event epicenter.
Felt The total number of felt reports
CDI The maximum reported intensity for the event.
MMI The maximum estimated instrumental intensity for the event.
Alert Level The alert level from the PAGER earthquake impact scale. Green, Yellow, Orange or Red.
Review Status reviewed Indicates whether the event has been reviewed by a human.
Tsunami 0 This flag is set to "1" for large events in oceanic regions and "0" otherwise. The existence or value of this flag does not indicate if a tsunami actually did or will exist.
SIG 298 A number describing how significant the event is. Larger numbers indicate a more significant event.
Network us The ID of a data contributor. Identifies the network considered to be the preferred source of information for this event.
Sources ,us, A comma-separated list of network contributors.
Number of Stations Used The total number of Number of seismic stations which reported P- and S-arrival times for this earthquake.
Horizontal Distance 4.817 Horizontal distance from the epicenter to the nearest station (in degrees).
Root Mean Square 0.62 sec The root-mean-square (RMS) travel time residual, in sec, using all weights.
Azimuthal Gap 108 The largest azimuthal gap between azimuthally adjacent stations (in degrees).
Magnitude Type mb The method or algorithm used to calculate the preferred magnitude for the event.
Event Type earthquake Type of seismic event.
Event ID us6000d5fg Id of event.
Event Code 6000d5fg An identifying code assigned by, and unique from, the corresponding source for the event.
Event IDS ,us6000d5fg, A comma-separated list of event ids that are associated to an event.

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